I became a coordinator of CodeChef Lunchtimes, and we are in need of high-quality proposals.
We hope to get rid of the 'CodeChef has low-quality problems' label.
So we would be grateful if you can provide a problem set that will work fine for the IOI-style contest! (Note that your problems should not necessarily follow the IOI syllabus).
You can read about compensation and the required difficulty of problems here.
Proposals for Lunchtimes should be submitted to the following e-mail: firstname.lastname@example.org
P.S. If you have hard problems for CodeChef Long Challenges, you can send them here